package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

import java.util.List;

import static com.hmdp.utils.RedisConstants.CACHE_SHOP_TYPE_KEY;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {


    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Resource
    private IShopTypeService typeService;


    @Override
    public Result queryTypeList() {

        //从Redis中查询类别数据
        String cacheKey=CACHE_SHOP_TYPE_KEY;

        String shopTypeJson = stringRedisTemplate.opsForValue().get(cacheKey);

        //判断Redis是否含有
        if(StrUtil.isNotBlank(shopTypeJson))
        {
            //存在，返回数据
            List<ShopType> shopTypes = JSONUtil.toList(shopTypeJson, ShopType.class);
            return Result.ok(shopTypes);
        }

        //Redis不存在，在数据库中查找
        List<ShopType> shopTypes = query().orderByAsc("sort").list();

        if(shopTypes==null)
        {
            return Result.fail("分类不存在！");
        }

        //存入Redis
        stringRedisTemplate.opsForValue().set(cacheKey,JSONUtil.toJsonStr(shopTypes));


        return Result.ok(shopTypes);
    }
}
